While the definition of a High Profile actor/actress may be a bit subjective on its own; lets just figure it is determined by the financial (an objective quantifier) success of past movies.
What kind of channels must production companies go through in order to obtain these people.
Is it just as its displayed and parodied ("Have your people call my people") or do they actually interact with the performer directly explaining the plot, duties of the role, have them go through a formal audition, etc. Or is there something in between that I have not thought of?